package com.wsjj.yjh;

import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class TransFilter {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        DataStreamSource<WaterSensor> source = env.fromElements(
                new WaterSensor("sensor_1", 1L, 1),
                new WaterSensor("sensor_1", 2L, 2),
                new WaterSensor("sensor_2", 2L, 2),
                new WaterSensor("sensor_3", 3L, 3)
        );
//      方式一：传入匿名类实现FilterFunction
        source.filter(new FilterFunction<WaterSensor>() {
            @Override
            public boolean filter(WaterSensor value) throws Exception {
                return value.id.equals("sensor_1");
            }
        }).print();
//      方式二：传入FilterFunction实现类
        source.filter(new UserFilter()).print();


        env.execute();

    }

    private static class UserFilter implements FilterFunction<WaterSensor> {
        @Override
        public boolean filter(WaterSensor value) throws Exception {
            return value.id.equals("sensor_1");
        }
    }
}
